Influence of liquid crystalline formation on the phase behavior of side-chain liquid crystalline block copolymers

被引:7
作者
Ji, Liangliang [1 ]
Chen, Xiaofang [1 ]
Wu, Yanhong [1 ]
Yang, Xiaoming [1 ]
Tu, Yingfeng [1 ]
机构
[1] Soochow Univ, Suzhou Key Lab Macromol Design & Precis Synth, Jiangsu Key Lab Adv Funct Polymer Design & Applic, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Liquid crystalline block copolymers; Self-assembly; Surface morphology; COIL DIBLOCK COPOLYMER; CONFORMATIONAL ASYMMETRY; THERMOTROPIC BEHAVIOR; TRIBLOCK COPOLYMER; THIN-FILMS; ONE-POT; MORPHOLOGY; NANOSTRUCTURES; TRANSITIONS; POLYMERS;
D O I
10.1016/j.polymer.2015.01.077
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A series of narrowly distributed diblock copolymers composed of amorphous components and side-chain liquid crystalline (LC) polymer, poly (butyl acrylate)-block-poly [8-(4-cyano-4'-biphenyl)-1-octanoyl acrylate] (PBA-b-PCBOA), with side-chain LC block weight fraction (f(w,PCBOA)) ranging from 25% to 87%, were synthesized by atom transfer radical polymerization (ATRP). Their thermal property, LC behavior, bulk phase behavior and thin film morphology were studied by differential scanning calorimetry (DSC), polarizing optical microscope (POM), small-angle X-ray scattering (SAXS) techniques and atomic force microscopy (AFM), respectively. The results show the diblock copolymers with different composition could present sphere, lamellar and cylinder morphologies before the order disorder transition. As the mesogen units self-organize to form smectic phase, the lamellar morphology dominates during the majority LC block weight fraction range (f(w,PCBOA) = 46%-77%) to minimized the surface energy. Interestingly, for spin-coated thin film, the lamella phase separation size decreased with increasing annealing time. For the copolymer with f(w,PCBOA) of 67%, a thermoreversible order order transition (OOT) and lamella to lamella/modified layer (L/ML), were observed. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:147 / 154
页数:8
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